Good theory is never disturbed -

Without healthy enough lungs there is little you can do.

PRANAYAMA has very little to do with breathing. Yet ordinarily it has.The whole scope of Raja-yoga is really to teach the control and direction of prana in different ways.
Sometimes in your own body the supply of prana gravitates more or less to one part; the balance is disturbed, and when the balance of prana is disturbed, what we call disease is produced. To take away the superfluous prana, or to supply the prana that is wanting, will be to cure the disease.
The most obvious manifestation of prana in the human body is the motion of the lungs. If that stops, as a rule all other manifestations of force in the body will immediately stop.
If you are strong and healthy, those who live near you will also have a tendency to become strong and healthy ... There have been cases where this process has been carried on at a distance. But in reality there is no distance which admits of gaps. ... Cases of healing from a distance are perfectly true. Prana can be transmitted to a very great distance; but for one genuine case there are hundreds of frauds.
Why should not the soul, by intensifying its action, attain perfection in this very life? ...

THE WORLD-MOVERS, endowed with gigantic will-power, can bring their prana into a high state of vibration; and it is so great and powerful that it affects others in a moment,
In this universe ... (each) form represents ... one whirlpool in the ... ocean of matter. The whirlpools are ever changing. ... Not one body remains the same. ... Not one is constant, but everything is changing ...
Think of the whole thing as a circle, the centre of which is perfection. The farther you move from the centre, the slower are the virations. Matter is the outermost plane; next comes mind; and Spirit is the centre.
Yogis say that ... the mind can function on a still higher plane, the superconscious. When the mind has attained that state, which is called samidhi - perfect concentration - it goes beyond the limits of reason and comes face to face with facts which no instinct or reason can ever know.
That part (of pranayama) which attempts to control the manifestations of prana as mental force, is called Raja-yoga.

TO PERCEIVE when there is more or less prana in one part of the body than there should be is also part of pranayama. The perception will be so subtle that the mind will feel that there is less prana in the toe or the finger than there should be and will possess the power to supply it.
cheers
Arun ..pls practise pranayama .....